ON 20060317@12:10:57 PM at page:
http://www.piclist.com/piclist/begin.htm#38793.2835300926
James Newton[JMN-EFP-786] published post 38793.2835300926

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Can't re-program chip after code protecting the data eeprom
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ON 20060321@2:10:16 PM at page:
http://www.piclist.com/techref/piclist/questions.htm#38797.590462963
Derick Q Siu[DQS-EbCon-FBA] Says

Hi there,<BR>
<BR>
I'm having a problem with the PIC18F452 Microcontroller specifically with the PORTA module.<BR>
<BR>
I have gone through this site for tips in dealing with PIC ports, and have followed the advice of eliminating all floating pins, setting unused pins to inputs, and grounding them with a 10K pull-down resistor.  Currently I am just trying to simply test my port pins so I can interface it with my LCD display.<BR>
<BR>
What I have is timer1 interrupting every 500MS and turning on and of RA0,RA1,RA2, and RE0.  for the most part RA2, and RE0 work fine, I am getting a pulse from them, but as for RA0 and RA1, they constantly are at 0V, and I am not sure why that is.  here is a snippet of my init code and isr function:<BR>
void port_init(void)<BR>
{<BR>
	// set PortA to output<BR>
	TRISA = 0xF8;<BR>
	TRISA = 0;<BR>
	ADON = 0; // turn off A/D converter<BR>
	//PORTA = 0x00; // clear PORT A<BR>
	RSclear();<BR>
	RWclear();<BR>
	Eclear();<BR>
<BR>
	// set PORTB to input<BR>
	TRISB = 0xFF; // set portb as inputs<BR>
	PORTB = 0x00; // clear Port B<BR>
	RBIP = 1; // set port b interrupt priority high<BR>
	INTEDG0 =1;<BR>
	INTEDG1 = 1;<BR>
	INTEDG2 = 1;<BR>
	INT1IP = 1;<BR>
	INT2IP = 1;<BR>
	INT0IE = 1;<BR>
	INT1IE=1;<BR>
	INT2IE=1;<BR>
	RBIE = 1; // enable the external interrupts<BR>
<BR>
	// set PORTD to output<BR>
	TRISD = 0x00;<BR>
	PORTD = 0x00;  // clear Port D<BR>
	<BR>
	PORTC = 0x00;<BR>
	TRISC = 0xBF; // set RC6 as output<BR>
<BR>
	// set PORTE to output<BR>
	PORTE = 0;<BR>
	TRISE = 0xFE;<BR>
}<BR>
// part of isr routine<BR>
	if((TMR1IF)&amp;&amp;(TMR1IE))<BR>
	{<BR>
		TMR1L = 0; // reset the timer<BR>
		TMR1H = 0;			<BR>
		if(buff != 0xFF){<BR>
        		changestate(0x52);<BR>
		}<BR>
		count ++;<BR>
		if(count == 5)<BR>
		{<BR>
/*--------------------Test routine------*/<BR>
			if(stat == 0xFF)<BR>
	    	{<BR>
				RE0=1;<BR>
                RA0 = 1;<BR>
                RA1 = 1;<BR>
  				RA2 = 1;<BR>
				changestate(0x00);<BR>
			}<BR>
			else<BR>
			{<BR>
				RE0=0;<BR>
				RA0=0;<BR>
				RA1=0;<BR>
				RA2=0;<BR>
				changestate(0xFF);<BR>
			}<BR>
/*---------------------------------------*/<BR>
			count = 0;<BR>
		}<BR>
		TMR1IF = 0; // reset the timer interrupt<BR>
	} // end if TMR1IF<BR>
<BR>
I'm not sure if it is my circuit, or in my programming, since I've been hearing that microchip is tyring to phase out the TRIS function, yet it is included in the include files and datasheets.<BR>
if anyone can helpme in this matter, it would be greatly appreciated.<BR>
<BR>
Thank you,<BR>
<BR>
Derick



ON 20060322@7:49:42 PM at page:
http://www.piclist.com/piclist/index.htm#38798.2697453704
James Newton[JMN-EFP-786] removed post 38798.2697453704

|Delete '<A TITLE="P-201.6.212.189" NAME="38798.2697453704" HREF="mailto:nyu@uol.com.br">nyu@uol.com.br</A> asks: &quot;<A NAME="201.6.212.189">
</A> 
Did you sell a copy of the &quot;Source Code Library&quot; in CD?<BR>
&quot;
<!-- 38798.2697453704 EOR -->

   <LI>'

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